FIFA rules state that World Cup matches must be played on pitches with natural grass. For this year's tournament, where some matches were scheduled in stadiums with artificial turf, special varieties of grass were required to withstand playing conditions and differing climates. Conor Knighton e...
Source: [CBS News](https://www.cbsnews.com/video/pitch-perfect-developing-natural-grass-for-the-world-cup/)